公开(公告)号：DE2512456A1

公开(公告)日：1976-10-07

申请号：DE2512456

申请日：1975-03-21

Applicant: BASF AG

Inventor： SOMMER FRANZ ING GRAD ,  UHL KARL DIPL ING DR ,  LOESER WERNER DIPL CHEM DR ,  FELLEISEN PETER DIPL ING ,  HAMMERSCHMITT PETER DIPL ING ,  SCHNEIDER RICHARD DIPL PHYS DR

IPC: G11B5/716 ,  G11B5/68 ,  B32B15/00 ,  H01F10/00

Abstract: The disc type magnetic data record carrier consists of a carrier material (S), a magnetic film (1) for the pick-up of servo information, a non-magnetic intermediate film (Z) and a second magnetic film (2) for the pick-up of data-information. The carrier material (S) is typically provided on both sides with foils. The film strength of each magnetic film is typically 0.06 to 0.6 um and the non-magnetic film has a film strength of 10 to 30 times that of the weaker films. The ratio of the coercive force between the first and second metal magnetic films is between 0.5 and 2.0. The surface of the second magnetic film is provided with a protective film.